#include <stdio.h>

typedef enum Week Week;

// 枚举的好处就是让代码的逻辑变得清晰

enum Week {
    MONDAY,
    TUESDAY,
    WEDNESDAY,
    THURSDAY,
    FRIDAY,
    SATURDAY,
    SUNDAY,
};

int main() {
    Week today = MONDAY;

    if (today == SATURDAY || today == SUNDAY) {
        printf("Today is weekend!\n");
    } else {
        printf("Today is working day\n");
    }

    return 0;
}